1 files changed, 63 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/lib/libspl/os/linux/zone.c b/sys/contrib/openzfs/lib/libspl/os/linux/zone.c
new file mode 100644
index 000000000000..f1520676753e
--- /dev/null
+++ b/sys/contrib/openzfs/lib/libspl/os/linux/zone.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2006 Ricardo Correia.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+
+#include <zone.h>
+
+zoneid_t
+getzoneid(void)
+{
+	char path[PATH_MAX];
+	char buf[128] = { '\0' };
+	char *cp;
+
+	int c = snprintf(path, sizeof (path), "/proc/self/ns/user");
+	/* This API doesn't have any error checking... */
+	if (c < 0 || c >= sizeof (path))
+		return (GLOBAL_ZONEID);
+
+	ssize_t r = readlink(path, buf, sizeof (buf) - 1);
+	if (r < 0)
+		return (GLOBAL_ZONEID);
+
+	cp = strchr(buf, '[');
+	if (cp == NULL)
+		return (GLOBAL_ZONEID);
+	cp++;
+
+	unsigned long n = strtoul(cp, NULL, 10);
+	if (n == ULONG_MAX && errno == ERANGE)
+		return (GLOBAL_ZONEID);
+	zoneid_t z = (zoneid_t)n;
+
+	return (z);
+}